More than 30,000 Stop & Shop employees went back to work Monday in Connecticut, Massachusetts and Rhode Island after an 11-day strike.

Workers and management reached a tentative agreement that includes wage increases and maintains health coverage.

David Cadden, a professor emeritus at the Quinnipiac University School of Business, said three-quarters of customers chose to shop somewhere else during the strike. And now Stop & Shop has to win those customers back.

“Maybe they went to a Walmart or Aldis and their focus is singularly on price. Other customers might stay with a Whole Foods or a Trader Joe’s. Or it just may be they had an antipathy to the idea of the staff having a strike at all.”

The strike overlapped with the shopping period for Easter and Passover. Cadden says Stop & Shop lost about $2 million a day during the strike – which could be around 5 percent of their annual revenue.

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Stop & Shop and its striking New England labor unions reached a tentative agreement on Easter Sunday to end an 11-day work stoppage that had shuttered some stores, left workers unpaid, and become an issue in the nascent presidential race.

Stop & Shop workers will be back on the job Monday morning after unions and management at the grocery chain announced Sunday evening that they had reached a tentative agreement on a new three-year contract. The announcement comes after a strike lasting 11 days, that affected 240 stores in Connecticut, Rhode Island and Massachusetts.

Former Vice President Joe Biden told a rally in Dorchester, Mass., Thursday that the 31,000 Stop & Shop workers on strike in New England are part of a movement to "take back this country."

"I know you're used to hearing political speeches, and I'm a politician. I get it," said Biden, who is mulling over a White House bid in 2020. "But this is way beyond that, guys. This is way beyond that. This is wrong. This is morally wrong, what's going on around this country. And I have had enough of it. I'm sick of it, and so are you."